One tablespoon of molasses weighs 21.2 g (poured, King Arthur Baking). Molasses is the heaviest spoon-measured ingredient in this whole series — denser than honey, denser than maple syrup, and nearly three times heavier than a tablespoon of cornstarch — because it is a thick, concentrated sugar syrup with very little water. The figure matters in gingerbread and baked beans, where molasses is measured by the tablespoon and its weight decides the moisture, the sweetness and the dark colour of the finished dish. It also matters for nutrition, since a tablespoon carries about 60 calories and a significant amount of iron and calcium. All weights on this page are approximate; molasses clings to the spoon, so verify with a scale when precision matters.
How much does 1 tablespoon of molasses weigh?
One level tablespoon of molasses weighs 21.2 g, poured, according to King Arthur Baking. That is the headline number, but a single tablespoon is rarely the whole story — most recipes use several spoonfuls, or a fraction of a cup, so the table below gives the weights you will actually reach for, from a teaspoon up to a full cup. Every figure is derived from the same source value of 340 g per cup, so the whole table is consistent. Treat all of these as approximate: poured is a technique, not a machine setting, and two cooks measuring the same ingredient can differ by a gram or two per spoonful. When the recipe matters, weigh the ingredient on a kitchen scale instead.
| Amount | Weight (approx.) |
| --- | --- |
| 1 teaspoon | 7.1 g |
| 1 tablespoon | 21.2 g |
| 2 tablespoons | 42.5 g |
| 3 tablespoons | 63.8 g |
| 1/4 cup (4 tbsp) | 85 g |
| 1/2 cup (8 tbsp) | 170 g |
| 3/4 cup (12 tbsp) | 255 g |
| 1 cup (16 tbsp) | 340 g |
A useful rule of thumb: there are 3 teaspoons in a tablespoon and 16 tablespoons in a cup, so you can move between any of these measures by multiplying or dividing. If a recipe calls for 2 teaspoons and you only have a tablespoon measure, that is two-thirds of a tablespoon — about 14.2 g. If a recipe calls for a quarter cup and you only have a tablespoon, that is 4 level tablespoons. Keep the tablespoons to grams converter open while you cook and you will never need to do the arithmetic in your head.
Worked examples
A gingerbread loaf
A dark gingerbread loaf uses 8 tablespoons of molasses — about 170 g — with 2 cups of flour and a tablespoon of ground ginger. The weight matters because molasses is both the sweetener and the main liquid in the recipe: 170 g of molasses brings about 40 g of water into the batter, and that water decides whether the loaf is moist or dry. Weighing the molasses straight into the bowl is also far cleaner than counting eight sticky spoonfuls, and it lets you adjust the recipe: a lighter gingerbread uses 6 tablespoons (127 g) and a little extra honey, while a darker, more bitter loaf uses the full 8. The molasses also reacts with the baking soda in the recipe, so the amount of leavening is calibrated to the molasses weight.
Baked beans for a crowd
A pot of baked beans for eight uses 6 tablespoons of molasses — about 127 g — stirred into the sauce with mustard and tomato. The weight is useful because molasses is the ingredient that gives baked beans their dark colour and deep, slightly bitter sweetness, and the balance is delicate: too little and the beans taste flat and tomatoey, too much and they turn cloyingly sweet and dark. Weighing 127 g lets you reproduce the same pot every time, and it also tells you how much sugar you are adding — about 75 g of sugars in the whole pot, or under 10 g per serving, which is less than most people expect.
A barbecue glaze
A barbecue glaze for ribs uses 4 tablespoons of molasses — about 85 g — whisked with ketchup, vinegar and spices. The molasses is what makes the glaze stick to the meat and caramelise on the grill, and its weight matters because the glaze's thickness depends on it: too much molasses and the glaze burns before the meat is done, too little and it slides off. Weighing 85 g gives a glaze that coats the ribs in a thin, even layer, and the high sugar content means it should go on in the last 10 minutes of cooking, not at the start, or the sugars will blacken.
How to measure a tablespoon of molasses correctly
Molasses is measured poured, and the honest way to do it is to weigh it. It is extremely viscous — thicker than honey, thicker than maple syrup — so it pours slowly, clings to the spoon, and leaves a residue that makes spoon measures inaccurate by a gram or two per tablespoon. If you must use a spoon, oil it lightly first: a thin coat of neutral oil lets the molasses slide off cleanly, and the tiny amount of oil does not affect the recipe. Pour slowly, let the spoon fill to the brim, and give it time to finish dripping. For baking, weigh the molasses directly into the mixing bowl: tare the bowl, pour to the target weight, and there is nothing to scrape. The King Arthur figure of 21.2 g per tablespoon is for unsulphured molasses at room temperature; blackstrap molasses is slightly denser and more bitter, at about 21.5 g per tablespoon, so treat the figure as approximate for blackstrap.
When the weight matters most
Molasses' tablespoon weight matters most in gingerbread and other dark baking, where it is a sweetener, a liquid and a leavening partner all at once. Its acidity reacts with baking soda to give lift, so the amount of molasses and the amount of soda are calibrated together — change the molasses by a few tablespoons and the leavening balance shifts. Its water content affects the crumb's moisture, and its sugars affect browning: molasses browns fast, so gingerbread baked with too much molasses can burn on the outside while staying raw inside. The weight also matters for nutrition, because molasses is one of the few sweeteners with meaningful minerals — a tablespoon provides about 20 percent of the daily iron for an adult — and knowing the gram weight is what makes those numbers real. In savoury cooking the weight matters less, but in baking it is the difference between a moist, dark loaf and a dry, bitter one.
Common mistakes to avoid
The most common mistake is measuring molasses with a dry spoon and losing a gram or two to the sides on every tablespoon — across a recipe that uses 8 tablespoons, that is 15 g of missing molasses, and the loaf comes out drier and less sweet than intended. Oil the spoon or weigh it. The second mistake is using blackstrap molasses in a recipe written for regular molasses: blackstrap is much more bitter and less sweet, and the result can be unpleasantly harsh. Use regular unsulphured molasses unless the recipe specifically calls for blackstrap. The third mistake is adding molasses to a recipe without adjusting the other liquids — molasses is about a quarter water, so a recipe that swaps it for sugar needs less additional liquid. Finally, do not store molasses in the fridge: it turns nearly solid and impossible to pour. Keep it in a cool, dark cupboard.
Frequently asked questions
How many grams is 1 tablespoon of molasses?
One tablespoon of molasses weighs 21.2 g, poured, according to King Arthur Baking. One teaspoon weighs about 7.1 g. These are approximate weights — molasses clings to the spoon, so weigh it for the most accurate result.
How many tablespoons of molasses are in 100 g?
There are about 5 tablespoons in 100 g of molasses (100 divided by 21.2 is 4.7). A standard 350 g jar holds about 16 tablespoons.
Can I use honey instead of molasses?
You can, but the flavour will be very different. Honey is lighter and sweeter, while molasses is dark, bitter and mineral. Use 1:1 by weight, and expect a lighter colour and a milder flavour. For gingerbread, molasses is essential — honey will not give the same dark, spiced character.
What is the difference between molasses and blackstrap molasses?
Blackstrap is the third boiling of the sugar syrup, so it is darker, more bitter and less sweet than regular molasses, with more minerals. Regular unsulphured molasses is the one most recipes mean. Do not swap them 1:1 in delicate baking — blackstrap can overwhelm the flavour.
How long does molasses last?
Up to 1 year in a cool, dark cupboard, sealed tightly. Molasses does not spoil easily, but it can crystallise over time — warm the jar gently in hot water to dissolve the crystals. Discard it if it smells off or shows mould.
Related conversions
If you cook with this ingredient regularly, these pages will help: the tablespoons to grams converter for any amount, the cups to grams converter for larger quantities, and the full ingredient guide for storage, substitutes and the weight of a whole cup. You can also compare the cup weight on the Molasses cups to grams page or work backwards from a gram amount on the Molasses grams to cups page.
You may also want Honey tbsp to grams, Brown Sugar ingredients, Molasses cups to grams and Molasses grams to cups.